Determine if the argument can be converted to a Date value.

vValue: The argument which is checked to see if it can be converted to a Date value. Function returns True if vValue contains a numeric value, a date value, a numeric string value, or a date string value which is within the range of values supported by the Date data type. Function returns False otherwise, such as if vValue is out-of-range, Null, an error, or an object pointer.

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